I’d like you to try a quick thought experiment: Imagine doing one intense workout in the course of a month. You charge yourself up, you break through your mental block, and you finally go to that fitness bootcamp you’ve been dreading. You lay it all on the line, and you kick butt. What effects will this have on your health?
Over the short term, there will be huge effects. Protein synthesis and catabolism will both be through the roof. You might burn in excess of a thousand calories, prompting significant lipolysis. You’ll spend a couple of hours bathed in adrenaline, and then you’ll get some feel-good chemicals in the aftermath.
Over the long term, what is the effect of a single intense workout over the course of a month? Probably… nothing at all. A single workout isn’t capable of moving the needle on your scale, let alone prompting lasting physical changes in your body, or biochemical changes in your brain. Why? Because of negative feedback. Because of the inertia of homeostasis. When your body notices big changes in your blood, it releases hormones to counteract that. When your sympathetic nervous system is in an unusual state of overdrive, it will tip the balance in the other direction until you can relax and digest.